The phrase "already existing one" is correct and usable in written English.
It can be used to refer to something that is currently in existence or already established, often in contrast to something new or proposed.
Example: "We decided to enhance the features of the already existing one instead of creating a new model from scratch."
Alternatives: "currently existing one" or "pre-existing one".
Thus, the prediction of the influence of a new tunnel construction on an already existing one plays a key role in the optimal design and construction of close parallel shield tunnels in order to avoid any damage to the existing tunnel during and after excavation of the new tunnel.
He added: "This action could range from lifelong Olympic bans for any implicated person, to tough financial sanctions, to acceptance of suspension or exclusion of entire national federations like the already existing one for the Russian Athletics Federation by the International Association of Athletics Federations.
New diversity mixing itself into the already existing one challenges the self-conception and self-understanding of the traditional groups and their identities.
The review takes a critical look at the relative merits of therapies being developed to tackle inappropriate complement activation that are likely to result in sporadic autoimmune diseases or worsen already existing one.
As Cardon et al. (2013), entrepreneurial passion is operationalized as passion for inventing-searching for a new business opportunity in new markets, founding-establishing a new business, and developing an already existing one.
If the authorization check is successful, the MBSC-SS issues an MBS Context Request towards the ASN-GW in order to either trigger the creation of a new multicast context or reuse an already existing one for the new client.
It is possible to create new data types, based on the limits of already existing ones.
We give in [1] an upper global bound (i.e., depending on and only) which happens to be better than already existing ones.
He misses no opportunity to invent new words, or to play with the ambiguities of already existing ones.
Past improvements to the dictionary have primarily focused on adding new entries and senses of words, rather than revising the already existing ones that had become out of date.
Secondary crystallization involves the insertion of new lamellar crystals in between the already existing ones.
